CVE-2026-4408— Samba: remote code execution in samr
Possible ATT&CK Techniques 1AI
T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 22
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I. Basic Information for CVE-2026-4408
Vulnerability Information
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Vulnerability Title
Samba: remote code execution in samr
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in Samba. A remote attacker can exploit a misconfiguration in Samba file servers and classic domain controllers that use the "check password script" feature. If this script is configured with the %u substitution character, the client-controlled username is passed without proper escaping of shell meta-characters. This vulnerability allows an attacker to achieve remote command execution on the affected system. This issue primarily affects non-standard configurations where the "check password script" is used with %u and the samba-dcerpcd service is started as a system service.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Samba 操作系统命令注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Samba是Samba开源的一个适用于 Linux 和 Unix 的标准 Windows 互操作性程序套件。 Samba存在操作系统命令注入漏洞，该漏洞源于check password script功能中%u替换字符未正确转义shell元字符，可能导致远程命令执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | 0:4.23.5-109.el10_2 ~ * | cpe:/o:redhat:enterprise_linux:10.2 | |
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | 0:4.21.3-114.el10_0.1 ~ * | cpe:/o:redhat:enterprise_linux_eus:10.0 | |
| Red Hat | Red Hat Enterprise Linux 7 Extended Lifecycle Support | 0:4.10.16-26.el7_9.1 ~ * | cpe:/o:redhat:enterprise_linux:7::server | |
| Red Hat | Red Hat Enterprise Linux 7 Extended Lifecycle Support | 0:4.10.16-26.el7_9.1 ~ * | cpe:/o:redhat:enterprise_linux:7::server | |
| Red Hat | Red Hat Enterprise Linux 8 | 0:4.19.4-16.el8_10 ~ * | cpe:/a:redhat:enterprise_linux:8::appstream | |
| Red Hat | Red Hat Enterprise Linux 8 | 0:4.19.4-16.el8_10 ~ * | cpe:/a:redhat:enterprise_linux:8::appstream | |
| Red Hat | Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | 0:4.13.3-12.el8_4.1 ~ * | cpe:/o:redhat:rhel_aus:8.4::baseos | |
| Red Hat | Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On | 0:4.13.3-12.el8_4.1 ~ * | cpe:/o:redhat:rhel_aus:8.4::baseos | |
| Red Hat | Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | 0:4.15.5-16.el8_6.1 ~ * | cpe:/a:redhat:rhel_aus:8.6::appstream | |
| Red Hat | Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On | 0:4.15.5-16.el8_6.1 ~ * | cpe:/a:redhat:rhel_aus:8.6::appstream | |
| Red Hat | Red Hat Enterprise Linux 8.8 Telecommunications Update Service | 0:4.17.5-7.el8_8.1 ~ * | cpe:/a:redhat:rhel_e4s:8.8::appstream | |
| Red Hat | Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions | 0:4.17.5-7.el8_8.1 ~ * | cpe:/a:redhat:rhel_e4s:8.8::appstream | |
| Red Hat | Red Hat Enterprise Linux 9 | 0:4.23.5-10.el9_8 ~ * | cpe:/a:redhat:enterprise_linux:9::appstream | |
| Red Hat | Red Hat Enterprise Linux 9 | 0:4.23.5-10.el9_8 ~ * | cpe:/a:redhat:enterprise_linux:9::appstream | |
| Red Hat | Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions | 0:4.17.5-105.el9_2.5 ~ * | cpe:/a:redhat:rhel_e4s:9.2::appstream | |
| Red Hat | Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions | 0:4.19.4-105.el9_4.4 ~ * | cpe:/a:redhat:rhel_e4s:9.4::appstream | |
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support | 0:4.21.3-14.el9_6.1 ~ * | cpe:/a:redhat:rhel_eus:9.6::appstream | |
| Red Hat | Red Hat OpenShift Container Platform 4.19 | 4.19.9.6.202606241344-0 ~ * | cpe:/a:redhat:openshift:4.19::el9 | |
| Red Hat | Red Hat OpenShift Container Platform 4.20 | 4.20.9.6.202606241928-0 ~ * | cpe:/a:redhat:openshift:4.20::el9 | |
| Red Hat | Red Hat OpenShift Container Platform 4.21 | 4.21.9.6.202606241859-0 ~ * | cpe:/a:redhat:openshift:4.21::el9 | |
| Red Hat | Red Hat Enterprise Linux 6 | - | cpe:/o:redhat:enterprise_linux:6 | |
| Red Hat | Red Hat Enterprise Linux 6 | - | cpe:/o:redhat:enterprise_linux:6 |
II. Public POCs for CVE-2026-4408
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-4408 (1)
Vendor Advisories for CVE-2026-4408 (6)
- 🔗 2479762 – (CVE-2026-4408) CVE-2026-4408 samba: Remote Code Execution in SAMR Read full article issue-trackingx_refsource_REDHAT
- 🔗 RHSA-2026:22963 - Security Advisory - Red Hat Customer Portal Read full article vendor-advisoryx_refsource_REDHAT
- 🔗 RHSA-2026:29799 - Security Advisory - Red Hat Customer Portal Read full article vendor-advisoryx_refsource_REDHAT
Other References for CVE-2026-4408 (9)
Same Patch Batch · Red Hat · 2026-05-28 · 14 CVEs total
| CVE-2026-9804 | 7.7 HIGH | Kubevirt: kubevirt: vmexport directory symlink escape enables exporter pod file read |
| CVE-2026-9795 | 7.3 HIGH | Keycloak: keycloak: privilege escalation via improper scope mapping enforcement |
| CVE-2026-44604 | 7.0 HIGH | Rpm: command injection in rpmuncompress dountar() via unescaped archive top-level director |
| CVE-2026-9802 | 6.8 MEDIUM | Keycloak: keycloak: unauthorized account access via replayed refresh tokens after cluster |
| CVE-2026-9792 | 6.5 MEDIUM | Keycloak: keycloak: security restriction bypass allows unauthorized ropc token acquisition |
| CVE-2026-9796 | 6.5 MEDIUM | Keycloak: keycloak: privilege escalation via time-of-check to time-of-use (toctou) vulnera |
| CVE-2026-9793 | 5.9 MEDIUM | Keycloak: keycloak: security policy bypass in jwe-encrypted request object processing |
| CVE-2026-9794 | 5.3 MEDIUM | Keycloak: keycloak: information disclosure via saml ecp endpoint |
| CVE-2026-9803 | 5.3 MEDIUM | Keycloak: keycloak: denial of service via malformed authorization header |
| CVE-2026-9801 | 4.9 MEDIUM | Keycloak: keycloak: denial of service via malformed ldap password policy response |
| CVE-2026-9791 | 4.3 MEDIUM | Keycloak-rhel9: organization data leak after feature disabled in keycloak |
| CVE-2026-9798 | 4.3 MEDIUM | Keycloak: keycloak: brute-force protection bypass in ciba flow |
| CVE-2026-10028 | 4.3 MEDIUM | Glib-networking: infinite loop in glib-networking gnutls backend allows remote denial of s |
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V. Comments for CVE-2026-4408
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